Sanitary mask sheet

A sanitary mask sheet assembly, comprising:

• a plurality of sheets, wherein the plurality of sheets include:
• a planar-shaped base sheet, and a projecting-and-depressed sheet with a first surface and a second surface opposite the first surface and having a plurality of projections projecting outward in a thickness direction and depress ions between the plurality of projections at least on the first surface in a natural state of the sanitary mask sheet assembly, wherein the projecting-and-depressed sheet includes:
• a fine fiber layer having an average fiber diameter of 3000 nm or less and a density of 0.05 g/cm3 or more, and a protection sheet for the fine fiber layer, a density of the protection sheet being lower than the density of the fine fiber layer, wherein the protection sheet has a strength to protect the fine fiber layer, wherein the protection sheet has a shape laid along a first surface of the fine fiber layer, wherein the planar-shaped base sheet is laminated on the second surface of the projecting-and-depressed sheet, wherein the projecting-and-depressed sheet is joined with the planar-shaped base sheet at the depressions, wherein the protection sheet directly contacts the planar-shaped base sheet, wherein a capture rate of particles for the protection sheet is lower than a capture rate of particles for the fine fiber layer and wherein the fine fiber layer directly contacts the planar-shaped base sheet.